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Based on 6 Sigma quality improvement projects valve ball

Author: ShiZhiTong
Tutor: HeShuGuangï¼›ZengXiaoPing
School: Tianjin University
Course: Industrial Engineering
Keywords: 6 Sigma Ball Quality Improvement Tooling Control Charts
CLC: F407.4
Type: Master's thesis
Year: 2009
Downloads: 38
Quote: 0
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Abstract


In a refrigeration system, ball valve is a common element, but once the ball valve has a fault, the damage caused by the influence and is huge. Valve ball is one of the most important parts in ball valve, valve ball quality affect the ball valve of the two key indicators: leak and torque. In this paper, firstly the concept of six sigma management, origin and development of relations with ISO9000 and six sigma DMAIC typical methods to solve the problem are introduced. Based on six sigma are studied on this basis, the method of D company valve ball product qualified rate increase. First of all, according to the requirement of the customer analysis out of the valve ball's key quality characteristics. Secondly using historical data to get pareto chart analysis unqualified valve ball's three main problem: symmetrical degree, vertical degree and the ball diameter super poor. Analysis step by step is find out the cause after the root cause of this three size out-of-tolerance: ball size out-of-tolerance, the operation of machining tooling and unqualified staff. Finally based on three fundamental reasons for this to take the corresponding control method. After the completion of the project, the valve ball qualified rate increased to 98.1%, more than the initial set of goals. Successful implementation makes the D company to regain the trust of the customers, improve the quality of the product and greatly reduce the internal cost of inferior quality.

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